Second-order distortion correcting receiver and second-order distortion correcting method

Abstract

A second-order distortion correcting receiver and a second-order distortion correcting method, wherein second-order inter-modulation distortion can be cancelled with high precision and with a simple circuit configuration, without requiring a complicated adjustment step. A non-linear active element unit () performs non-linear processing on an input signal to output a differential output signal and common mode output signal. A common mode detection unit () extracts the common mode output signal. A weighting unit () weights the extracted common mode output signal and thereby generates a corrected signal. A corrected signal injection unit () injects the corrected signal into a differential output signal to output a corrected differential output signal. A DC detection unit () calculates the average DC component of the corrected differential output signal. A weight determining unit () uses the average DC component to determine the weighting coefficient used by the weighting unit (). At this time, the weight determining unit () sets, as the weighting coefficient, the coefficient that reduces the average DC component included in the corrected differential output signal to zero.